1: # The LearningOnline Network
2: # Cookie Based Access Handler
3: #
4: # $Id: lonacc.pm,v 1.94 2006/08/30 16:50:23 albertel Exp $
5: #
6: # Copyright Michigan State University Board of Trustees
7: #
8: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
9: #
10: # LON-CAPA is free software; you can redistribute it and/or modify
11: # it under the terms of the GNU General Public License as published by
12: # the Free Software Foundation; either version 2 of the License, or
13: # (at your option) any later version.
14: #
15: # LON-CAPA is distributed in the hope that it will be useful,
16: # but WITHOUT ANY WARRANTY; without even the implied warranty of
17: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18: # GNU General Public License for more details.
19: #
20: # You should have received a copy of the GNU General Public License
21: # along with LON-CAPA; if not, write to the Free Software
22: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23: #
24: # /home/httpd/html/adm/gpl.txt
25: #
26: # http://www.lon-capa.org/
27: #
28: ###
29:
30: package Apache::lonacc;
31:
32: use strict;
33: use Apache::Constants qw(:common :http :methods);
34: use Apache::File;
35: use Apache::lonnet;
36: use Apache::loncommon();
37: use Apache::lonlocal;
38: use Apache::restrictedaccess();
39: use CGI::Cookie();
40: use Fcntl qw(:flock);
41: use LONCAPA;
42:
43: sub cleanup {
44: my ($r)=@_;
45: if (! $r->is_initial_req()) { return DECLINED; }
46: &Apache::lonnet::save_cache();
47: return OK;
48: }
49:
50: sub goodbye {
51: my ($r)=@_;
52: &Apache::lonnet::goodbye();
53: return DONE;
54: }
55:
56: ###############################################
57:
58: sub get_posted_cgi {
59: my ($r) = @_;
60:
61: my $buffer;
62: if ($r->header_in('Content-length')) {
63: $r->read($buffer,$r->header_in('Content-length'),0);
64: }
65: unless ($buffer=~/^(\-+\w+)\s+Content\-Disposition\:\s*form\-data/si) {
66: my @pairs=split(/&/,$buffer);
67: my $pair;
68: foreach $pair (@pairs) {
69: my ($name,$value) = split(/=/,$pair);
70: $value =~ tr/+/ /;
71: $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
72: $name =~ tr/+/ /;
73: $name =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
74: &Apache::loncommon::add_to_env("form.$name",$value);
75: }
76: } else {
77: my $contentsep=$1;
78: my @lines = split (/\n/,$buffer);
79: my $name='';
80: my $value='';
81: my $fname='';
82: my $fmime='';
83: my $i;
84: for ($i=0;$i<=$#lines;$i++) {
85: if ($lines[$i]=~/^$contentsep/) {
86: if ($name) {
87: chomp($value);
88: if ($fname) {
89: $env{"form.$name.filename"}=$fname;
90: $env{"form.$name.mimetype"}=$fmime;
91: } else {
92: $value=~s/\s+$//s;
93: }
94: &Apache::loncommon::add_to_env("form.$name",$value);
95: }
96: if ($i<$#lines) {
97: $i++;
98: $lines[$i]=~
99: /Content\-Disposition\:\s*form\-data\;\s*name\=\"([^\"]+)\"/i;
100: $name=$1;
101: $value='';
102: if ($lines[$i]=~/filename\=\"([^\"]+)\"/i) {
103: $fname=$1;
104: if
105: ($lines[$i+1]=~/Content\-Type\:\s*([\w\-\/]+)/i) {
106: $fmime=$1;
107: $i++;
108: } else {
109: $fmime='';
110: }
111: } else {
112: $fname='';
113: $fmime='';
114: }
115: $i++;
116: }
117: } else {
118: $value.=$lines[$i]."\n";
119: }
120: }
121: }
122: #
123: # Digested POSTed values
124: #
125: # Remember the way this was originally done (GET or POST)
126: #
127: $env{'request.method'}=$ENV{'REQUEST_METHOD'};
128: #
129: # There may also be stuff in the query string
130: # Tell subsequent handlers that this was GET, not POST, so they can access query string.
131: # Also, unset POSTed content length to cover all tracks.
132: #
133:
134: $r->method_number(M_GET);
135:
136: $r->method('GET');
137: $r->headers_in->unset('Content-length');
138: }
139:
140: # handle the case of the single sign on user, at this point $r->user
141: # will be set and valid now need to find the loncapa user info and possibly
142: # balance them
143: # returns OK if it was a SSO and user was handled
144: # undef if not SSO or no means to hanle the user
145: sub sso_login {
146: my ($r,$lonid,$handle) = @_;
147:
148: my $lonidsdir=$r->dir_config('lonIDsDir');
149: if (!($r->user
150: && (!defined($env{'user.name'}) && !defined($env{'user.domain'}))
151: && (!$lonid || !-e "$lonidsdir/$handle.id" || $handle eq ''))) {
152: # not an SSO case or already logged in
153: return undef;
154: }
155:
156: my $domain = $r->dir_config('lonDefDomain');
157: my $home=&Apache::lonnet::homeserver($r->user,$domain);
158: if ($home !~ /(con_lost|no_host|no_such_host)/) {
159: if ($r->dir_config("lonBalancer") eq 'yes') {
160: # login but immeaditly go to switch server to find us a new
161: # machine
162: &Apache::lonauth::success($r,$r->user,$domain,$home,'noredirect');
163: $r->internal_redirect('/adm/switchserver');
164: } else {
165: # need to login them in, so generate the need data that
166: # migrate expects to do login
167: my %info=('ip' => $r->connection->remote_ip(),
168: 'domain' => $domain,
169: 'username' => $r->user,
170: 'server' => $r->dir_config('lonHostID'),
171: 'sso.login' => 1
172: );
173: my $token =
174: &Apache::lonnet::tmpput(\%info,
175: $r->dir_config('lonHostID'));
176: $env{'form.token'} = $token;
177: $r->internal_redirect('/adm/migrateuser');
178: }
179: return OK;
180: } elsif (defined($r->dir_config('lonSSOUserUnkownRedirect'))) {
181: $r->internal_redirect($r->dir_config('lonSSOUserUnkownRedirect'));
182: return OK;
183: }
184: return undef;
185: }
186:
187: sub handler {
188: my $r = shift;
189: my $requrl=$r->uri;
190: my %cookies=CGI::Cookie->parse($r->header_in('Cookie'));
191: my $lonid=$cookies{'lonID'};
192: my $cookie;
193: my $lonidsdir=$r->dir_config('lonIDsDir');
194:
195: my $handle;
196: if ($lonid) {
197: $handle=$lonid->value;
198: $handle=~s/\W//g;
199: }
200:
201: if (my $result = &sso_login($r,$lonid,$handle)) {
202: return $result
203: }
204:
205:
206: if ($r->dir_config("lonBalancer") eq 'yes') {
207: $r->set_handlers('PerlResponseHandler'=>
208: [\&Apache::switchserver::handler]);
209: }
210:
211: if ($handle eq '') {
212: $r->log_reason("Cookie $handle not valid", $r->filename);
213: } elsif ((-e "$lonidsdir/$handle.id") && ($handle ne '')) {
214:
215: # ------------------------------------------------------ Initialize Environment
216:
217: &Apache::lonnet::transfer_profile_to_env($lonidsdir,$handle);
218:
219: # --------------------------------------------------------- Initialize Language
220:
221: &Apache::lonlocal::get_language_handle($r);
222:
223: }
224:
225: # -------------------------------------------------- Should be a valid user now
226: if ($env{'user.name'} ne '' && $env{'user.domain'} ne '') {
227: # -------------------------------------------------------------- Resource State
228:
229: if ($requrl=~/^\/+(res|uploaded)\//) {
230: $env{'request.state'} = "published";
231: } else {
232: $env{'request.state'} = 'unknown';
233: }
234: $env{'request.filename'} = $r->filename;
235: $env{'request.noversionuri'} = &Apache::lonnet::deversion($requrl);
236: # -------------------------------------------------------- Load POST parameters
237:
238: &Apache::lonacc::get_posted_cgi($r);
239:
240: # ---------------------------------------------------------------- Check access
241: my $now = time;
242: if ($requrl!~/^\/adm|public|prtspool\//) {
243: my $access=&Apache::lonnet::allowed('bre',$requrl);
244: if ($access eq '1') {
245: $env{'user.error.msg'}="$requrl:bre:0:0:Choose Course";
246: return HTTP_NOT_ACCEPTABLE;
247: }
248: if ($access eq 'A') {
249: &Apache::restrictedaccess::setup_handler($r);
250: return OK;
251: }
252: if (($access ne '2') && ($access ne 'F')) {
253: $env{'user.error.msg'}="$requrl:bre:1:1:Access Denied";
254: return HTTP_NOT_ACCEPTABLE;
255: }
256: }
257: if ($requrl =~ m|^/prtspool/|) {
258: my $start='/prtspool/'.$env{'user.name'}.'_'.
259: $env{'user.domain'};
260: if ($requrl !~ /^\Q$start\E/) {
261: $env{'user.error.msg'}="$requrl:bre:1:1:Access Denied";
262: return HTTP_NOT_ACCEPTABLE;
263: }
264: }
265: if ($env{'user.name'} eq 'public' &&
266: $env{'user.domain'} eq 'public' &&
267: $requrl !~ m{^/+(res|public|uploaded)/} &&
268: $requrl !~ m{^/adm/[^/]+/[^/]+/aboutme/portfolio$ }x &&
269: $requrl !~ m{^/+adm/(help|logout|restrictedaccess|randomlabel\.png)}) {
270: $env{'request.querystring'}=$r->args;
271: $env{'request.firsturl'}=$requrl;
272: return FORBIDDEN;
273: }
274: # ------------------------------------------------------------- This is allowed
275: if ($env{'request.course.id'}) {
276: &Apache::lonnet::countacc($requrl);
277: $requrl=~/\.(\w+)$/;
278: if ((&Apache::loncommon::fileembstyle($1) eq 'ssi') ||
279: ($requrl=~/^\/adm\/.*\/(aboutme|navmaps|smppg|bulletinboard)(\?|$ )/x) ||
280: ($requrl=~/^\/adm\/wrapper\//) ||
281: ($requrl=~m|^/adm/coursedocs/showdoc/|) ||
282: ($requrl=~m|\.problem/smpedit$|) ||
283: ($requrl=~/^\/public\/.*\/syllabus$/)) {
284: # ------------------------------------- This is serious stuff, get symb and log
285: my $query=$r->args;
286: my $symb;
287: if ($query) {
288: &Apache::loncommon::get_unprocessed_cgi($query,['symb']);
289: }
290: if ($env{'form.symb'}) {
291: $symb=&Apache::lonnet::symbclean($env{'form.symb'});
292: if ($requrl =~ m|^/adm/wrapper/|
293: || $requrl =~ m|^/adm/coursedocs/showdoc/|) {
294: my ($map,$mid,$murl)=&Apache::lonnet::decode_symb($symb);
295: &Apache::lonnet::symblist($map,$murl => [$murl,$mid],
296: 'last_known' =>[$murl,$mid]);
297: } elsif ((&Apache::lonnet::symbverify($symb,$requrl)) ||
298: (($requrl=~m|(.*)/smpedit$|) &&
299: &Apache::lonnet::symbverify($symb,$1))) {
300: my ($map,$mid,$murl)=&Apache::lonnet::decode_symb($symb);
301: &Apache::lonnet::symblist($map,$murl => [$murl,$mid],
302: 'last_known' =>[$murl,$mid]);
303: } else {
304: $r->log_reason('Invalid symb for '.$requrl.': '.
305: $symb);
306: $env{'user.error.msg'}=
307: "$requrl:bre:1:1:Invalid Access";
308: return HTTP_NOT_ACCEPTABLE;
309: }
310: } else {
311: $symb=&Apache::lonnet::symbread($requrl);
312: if (&Apache::lonnet::is_on_map($requrl) && $symb &&
313: !&Apache::lonnet::symbverify($symb,$requrl)) {
314: $r->log_reason('Invalid symb for '.$requrl.': '.$symb);
315: $env{'user.error.msg'}=
316: "$requrl:bre:1:1:Invalid Access";
317: return HTTP_NOT_ACCEPTABLE;
318: }
319: if ($symb) {
320: my ($map,$mid,$murl)=
321: &Apache::lonnet::decode_symb($symb);
322: &Apache::lonnet::symblist($map,$murl =>[$murl,$mid],
323: 'last_known' =>[$murl,$mid]);
324: }
325: }
326: $env{'request.symb'}=$symb;
327: &Apache::lonnet::courseacclog($symb);
328: } else {
329: # ------------------------------------------------------- This is other content
330: &Apache::lonnet::courseacclog($requrl);
331: }
332: }
333: return OK;
334: }
335: # -------------------------------------------- See if this is a public resource
336: if ($requrl=~m|^/+adm/+help/+|) {
337: return OK;
338: }
339: # ------------------------------------ See if this is a viewable portfolio file
340: if (&Apache::lonnet::is_portfolio_url($requrl)) {
341: my $access=&Apache::lonnet::allowed('bre',$requrl);
342: if ($access eq 'A') {
343: &Apache::restrictedaccess::setup_handler($r);
344: return OK;
345: }
346: if (($access ne '2') && ($access ne 'F')) {
347: $env{'user.error.msg'}="$requrl:bre:1:1:Access Denied";
348: return HTTP_NOT_ACCEPTABLE;
349: }
350: }
351:
352: # -------------------------------------------------------------- Not authorized
353: $requrl=~/\.(\w+)$/;
354: # if ((&Apache::loncommon::fileembstyle($1) eq 'ssi') ||
355: # ($requrl=~/^\/adm\/(roles|logout|email|menu|remote)/) ||
356: # ($requrl=~m|^/prtspool/|)) {
357: # -------------------------- Store where they wanted to go and get login screen
358: $env{'request.querystring'}=$r->args;
359: $env{'request.firsturl'}=$requrl;
360: return FORBIDDEN;
361: # } else {
362: # --------------------------------------------------------------------- Goodbye
363: # return HTTP_BAD_REQUEST;
364: # }
365: }
366:
367: 1;
368: __END__
369:
370: =head1 NAME
371:
372: Apache::lonacc - Cookie Based Access Handler
373:
374: =head1 SYNOPSIS
375:
376: Invoked (for various locations) by /etc/httpd/conf/srm.conf:
377:
378: PerlAccessHandler Apache::lonacc
379:
380: =head1 INTRODUCTION
381:
382: This module enables cookie based authentication and is used
383: to control access for many different LON-CAPA URIs.
384:
385: Whenever the client sends the cookie back to the server,
386: this cookie is handled by either lonacc.pm or loncacc.pm
387: (see srm.conf for what is invoked when). If
388: the cookie is missing or invalid, the user is re-challenged
389: for login information.
390:
391: This is part of the LearningOnline Network with CAPA project
392: described at http://www.lon-capa.org.
393:
394: =head1 HANDLER SUBROUTINE
395:
396: This routine is called by Apache and mod_perl.
397:
398: =over 4
399:
400: =item *
401:
402: transfer profile into environment
403:
404: =item *
405:
406: load POST parameters
407:
408: =item *
409:
410: check access
411:
412: =item *
413:
414: if allowed, get symb, log, generate course statistics if applicable
415:
416: =item *
417:
418: otherwise return error
419:
420: =item *
421:
422: see if public resource
423:
424: =item *
425:
426: store attempted access
427:
428: =back
429:
430: =cut
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